Method and a Computer Program Product for Providing a Response to A Statement of a User

ABSTRACT

A method for providing a response to a statement of a user, the method includes: receiving user input that comprises a portion of a user statement; selecting, before receiving a whole user statement, an answerable statement response between an answerable statement, multiple answerable statements and a response to an answerable statement; wherein the selecting is responsive to user input and to structured representations of answerable statements answerable by an answering entity; and sending to the user information representative of response to the user statement.

RELATED APPLICATIONS

This patent claims priority from U.S. provisional patent Ser. No.60/871,139, filed on Dec. 21, 2006.

FIELD OF THE INVENTION

The present invention relates generally to the field of communicatingwith a computer system in natural language and in particular, to methodsand systems for conversing with a human and answering his statementsover a specific knowledge domain using natural language and through atextual interface. “natural language” shall mean in the context of thisinvention as any human language such as English

BACKGROUND OF THE INVENTION

As computers and communication networks are continually becomingstronger, faster and more accessible—more information and knowledge isbeing moved from people and printed materials to computers.

Accessing that knowledge is traditionally done using computer-searchmethods and search engines. But these methods do not enable the searcherto get direct answers for his statements, or to converse about a topic.And the searcher is often required to browse through search results orto readjust his search query.

It is therefore highly desirable, to enable computers to answer and/orconverse about information in natural language. This task is considereddifficult with current technology and as of today there exist no systemthat successfully converses or answers statements with high accuracy andrelevancy of results. We propose a method and system that can performthe above task successfully.

There is a growing need to provide efficient methods, systems andcomputer program products for providing a response to a statement of auser.

SUMMARY OF THE INVENTION

A method for providing a response to a statement of a user, the methodincludes: receiving user input that includes a portion of a userstatement; selecting, before receiving a whole user statement, ananswerable statement response between an answerable statement, multipleanswerable statements and a response to an answerable statement; whereinthe selecting is responsive to user input and to structuredrepresentations of answerable statements answerable by an answeringentity; and sending to the user information representative of responseto the user statement.

A method for interacting with a person, the method includes: receiving auser textual input; matching a structured representation of the usertextual input against expected user statement fields of knowledgedatabase entries; wherein a knowledge database entry includes anexpected user statement field and at least one action field; whereinmultiple entries of the knowledge database form a data structure thatincludes multiple expected user statements fields that match an expectedsequence of user textual inputs.

A computer program product includes a computer usable medium including acomputer readable program for providing a response to a statement of auser, wherein the computer readable program when executed on a computercauses the computer to: receive user input that includes a portion of auser statement; select, before receiving a whole user statement, ananswerable statement response between an answerable statement, multipleanswerable statements and a response to an answerable statement; whereinthe selection is responsive to user input and to structuredrepresentations of answerable statements answerable by an answeringentity; and send to the user information representative of response tothe user statement.

A computer program product includes a computer usable medium including acomputer readable program for providing a response to a statement of auser, wherein the computer readable program when executed on a computercauses the computer to: receive a user textual input; match a structuredrepresentation of the user textual input against expected user statementfields of knowledge database entries; wherein a knowledge database entryincludes an expected user statement field and at least one action field;wherein multiple entries of the knowledge database form a data structurethat includes multiple expected user statements fields that match anexpected sequence of user textual inputs.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be readily understood by the followingdetailed description in conjunction with the accompanying drawings,wherein like reference numerals designate like structural elements.

A method for providing a response to a statement of a user, the methodincludes: receiving user input that includes at least a portion of auser statement; selecting an answerable statement response between ananswerable statement, multiple answerable statements and a request toreceive answerable statement selection information; wherein theselecting is responsive to user input and to structured representationsof answerable statements answerable by an answering entity; sending tothe user the answerable statement response; receiving an acceptanceindication from the user indicative of a user acceptance of ananswerable statement; sending to the answering entity informationrepresentative of the accepted answerable statement; receiving from theanswering entity the answering entity response; and sending to the userinformation representative of the answering entity response.

Conveniently, the multiple answerable statements include answerablestatements that at least partially match the user input.

Conveniently, the method includes performing a weighted comparisonbetween basic information units extracted from the user input to basicinformation units associated with each of the multiple answerablestatements.

Conveniently, the method includes selecting between multiple answerablestatements displayed to the user in response to audio informationprovided by the user.

Conveniently, the method includes comparing the initial user input to adata structure that includes multiple expected user statement fields,each associated with a request to receive answerable statement selectioninformation.

Conveniently, the method includes comparing the user input to the datastructure; wherein the data structure further includes at least oneexpected user statement field that is associated with an answerablestatement.

Conveniently, the method includes sending to the user multipleanswerable statements that are associated with each other.

Conveniently, the method includes detecting a problem in providing ananswerable statement to a user and sending a request to provide humanassistance in responding to the user input.

Conveniently, the method includes presenting to the user multipleanswerable statements that were sent to the user and resulted in anacceptance of a certain answerable statement by the user; and receivingan acceptance indication from the user indicative of an acceptance ofanother answerable statement out of the multiple answerable statements.

Conveniently, the method includes updating selection metadata in view ofat least one response of at least one user to at least one answerablestatement response; wherein the selection metadata affects the selectionof the answerable statement response.

Conveniently, the method includes applying natural language scriptsduring the selecting of the answerable statement.

Conveniently, the method includes selecting a single answerablestatement if the single answerable statement and the user input arecharacterized by a matching value that exceeds a first threshold andselecting multiple answerable statements if each of the multipleanswerable statements and the user input are characterized by a matchingvalue that exceeds a second threshold but is below the first threshold.

Conveniently, the method includes: receiving user input that includes afirst portion of a user statement; selecting an answerable statementresponse between an answerable statement, multiple answerable statementsand a request to receive answerable statement selection information;wherein the selecting is responsive to the user input and to structuredrepresentations of answerable statements answerable by an answeringentity; sending to the user the answerable statement response; receivinguser input that includes a second portion of a user statement; selectingan answerable statement response between an answerable statement,multiple answerable statements and a request to receive answerablestatement selection information; wherein the selecting is responsive tothe first portion and to the second portion of the user statement;sending to the user the answerable statement response; receiving anacceptance indication from the user indicative of a user acceptance ofan answerable statement; sending to the answering entity informationrepresentative of the accepted answerable statement; receiving from theanswering entity the answering entity response; and sending to the userinformation representative of the answering entity response.

Conveniently, the method includes generating a knowledge database of ananswering entity by converting knowledge manager input into a structuredrepresentation of the knowledge manager input.

Conveniently, the method includes providing to the knowledge managerinput feedback information indicating of a suggested knowledge managerinput.

FIG. 1 is block diagram of an application for updating a knowledgedatabase of entities that interact with the answering entity accordingto an embodiment of the invention;

FIG. 1A illustrates a knowledge management application and additionalentities according to an embodiment of the invention;

FIG. 2 is a block diagram of users and a system for responding to usersaccording to an embodiment of the invention;

FIG. 2A is an illustrative block diagram of an interaction applicationaccording to an embodiment of the invention;

FIGS. 3 and 3A illustrates various screens presented to a user during astatement evaluation stage according to an embodiment of the invention;

FIG. 3B is a flow chart of a feedback process according to an embodimentof the invention;

FIG. 4 illustrates a command according to an embodiment of theinvention;

FIG. 5 illustrates a method, according to an embodiment of theinvention; and

FIG. 6 illustrates a method according to an embodiment of the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

The figures and the following description relate to preferredembodiments of the present invention by way of illustration only. Itshould be noted that from the following discussion, alternativeembodiments of the structures and methods disclosed herein will bereadily recognized as viable alternatives that may be employed withoutdeparting from the principles of the claimed invention. Lines withoutarrowheads, in the context of this patent should be interpreted asbidirectional communication lines, in contrast to arrow-headed lines.

Computer systems that can converse with a user and answer userstatements about specific knowledge domains are disclosed. Methods aredisclosed that offer a good tradeoff between system performance andknowledge building efforts.

The suggested methods and systems can converse in text, such as in chatthrough computer (web-chat or phone-text messaging), and to some extente-mails. It is noted that speech recognition and additionally oralternatively speech synthesis capabilities or modules can be used inorder to enable speech conversations such as by conventional phones.

The applicability of the current invention is suitable to anycomputer-human interaction. However, it is especially suited to humaninteractions such as customer support, customer service, sales,promotions, inquiring, learning and training. One exemplary beneficialembodiment is adding a computer chat interface in a company's websiteand allowing visitors to chat about the company, its products andservices, promotions, to get suggestions about products, to get helpmatching customer needs to company offerings, to be surveyed, and tosend statements to offline personnel—all, and other similar activities,with immediate respond from the website and 24/7 availability. There isno current system doing the above with satisfactory results.

The features and advantages described in the specification are not allinclusive and, in particular, many additional features and advantageswill be apparent to one of ordinary skill in the art in view of thedrawings, specification, and claims. Moreover, it should be noted thatthe language used in the specification has been principally selected forreadability and instructional purposes, and may not have been selectedto delineate or circumscribe the inventive subject matter.

Conveniently a method for conducting natural language dialogue with auser without human intervention is provided.

Conveniently, a knowledge database is formed. Adding knowledge to theknowledge database, does not require programming skills such as defininga pattern matching rule nor does it require to decide where in theknowledgebase to file the newly added piece of knowledge, nor is it ablind process of feeding full documents to the system (such is the casein search engines).

FIG. 1 is block diagram of knowledge management application 12 and ofentities 11, 13 and 22 that interact with the answering entity accordingto an embodiment of the invention.

Knowledge Management Application (KMA) 12 processes input from KM 11input in the by the same mechanisms that process the user inputs. Andthe feedback mechanism alerts KM 11 about possible spelling errors, andthe like.

Knowledge Manager (KM) 11, is a human who preferably is acquainted withthe specific knowledge domain, can access KMA 12 which can be a softwareapplication running on a local or remote computer. KMA 12 can includemiddleware modules, hardware modules, software modules or a combinationthereof. KMA 12 receives information from KM 11 and transforms it tostructured knowledge that is stored in knowledge database 13. Thisknowledge will be used later by the computer to communicate usingnatural language. Knowledge database 13 can include a structuredrepresentation of answerable statements and a structure representationsof responses to these answerable statements. A statement is answerableif it can be answered by (one or more) answering entities (such as butnot limited to KD 13) that can interact with KMA 12 or be accessed byKMA 12. The building blocks of the structure representation ofanswerable statements are called basic information units, and representwords or word groups. “words” and basic information units will be usedhere interchangeably.

KMs 11 are using KMA 12 in order to periodically append, update, ordelete knowledge pieces from knowledge database 13.

Conveniently, multiple KMs 11 can work concurrently on the same KMA 12and knowledge database 13, and then each knowledge operation can bestored with the details of the KM 11 creating or updating it. In thepossible case where the KMA 12 will be running at a distant location,KMs 11 can access it through network/internet connections, and manydifferent knowledge domains could be served and hosted on the sameserver as in the SAAS (software as a service) model. The informationthat the KMs 11 are inputting (also referred to as knowledge managerinput or knowledge manager information) to KMA 12 may originate from KM11 or can be provided from various computerized or un-computerizeddocuments. A knowledge piece can be stored together with a bidirectionallink to its origin (such as document) so that it can be possible to getalerts when the original data is changed, in order to update it inknowledge database 13.

In cases where the information required to be computerized resides in anexternal database that is updated regularly (such as product prices andavailability database) this external database does not necessarily needto be cloned to knowledge database 13. Conveniently, knowledge database13 can serve as a mediator that queries the external database andretrieves the answer.

Knowledge database 13 can be a custom dictionary of words (also referredto as basic information units) and words families (also referred to asbasic information unit families). It includes synonyms, hypernyms,hyponyms, multiple-word phrases, and other word relations as one wantsto add.

This dictionary can be indexes for fast access (as by hash tables), andthe words and word-groups in it will be the building blocks used by thestructured-form representation.

Conveniently, knowledge database 13 includes a list of stop words(language words that have very low importance like “are” “very”“moreover”, “that”).

Conveniently, knowledge database 13 includes a list of “semi-stop words”that are words that will have medium importance level later on these caninclude numbers, names (of months, days), common verbs and adjectives(say, look, see, good, like)

Knowledge database 13 conveniently includes at least one structuredrepresentation of at least one of the following items: (i) Statement andanswer pairs (QA); (ii) Conversation Scripts (CS); (iii) Informationpieces in unstructured form; (iv) interaction log pieces; (v) OriginalKM's input; (vi) reference texts which are the origin of an informationpiece.

FIG. 1A illustrates knowledge management application 12 and additionalentities 22, 13 according to an embodiment of the invention. It is notedthat the various boxes of FIG. 1A represent method stages but can alsorepresent modules. For example, box 14 is denoted “sentence processing”but it can represent a sentence processing module.

Information inputted by KM 11 to KMA 12 can be a statement-answer pair,a statement describing something or a Natural Language Script (NLScript). The statement can be a question, a query, an answer, a problemdescription and the like.

KMA 12 conveniently transforms this (unstructured) information intostructured knowledge 18 that can be used by the computer in the futureto match a human statement or statement with the structured knowledge 18stored in the Knowledge Database 13, even if the human has useddifferent wordings or different sentence structure. To serve thispurpose, structured knowledge 18 is represented either as a canonicalnatural language statement, or, as a graph of connections betweenconcepts, properties, actions, and relations that represent languageelements.

The process of transforming unstructured text 17 to structured knowledge18 involves several steps.

The sentence processing 14 step includes at least one of the followingstages or a combination thereof: comparing words and phrases in theinformation to a general or special dictionary, detecting possiblespelling errors, determining word part-of-speech, parsing sentence andseparating them to phrases, functional roles and main versus auxiliaryparts of the sentence, identifying multi-word phrases, convertingsynonym words to their word group name, and transforming sentences tobasic tense. The end result of this purpose is to extract the relevantinformation in order to transform by the converter 15 (also referred tostructured form converter) the unstructured text 17 to structuredknowledge 18.

Conveniently, sentence processing includes: (i) receiving input in theform of unstructured text. i.e. “how can i send mail without revealingmy address”; (ii) for each word in the input above do the followingprocesses: (ii.a) converting to base word (this is called word-stemmingand is comprises of removing ‘ing’ ‘es’ ‘ies’ ‘ed’ ‘able’ etc.; (ii.b)looking for this word in the knowledge database 13 custom dictionary andin the stop-words and semi-stop words lists; (ii.c) if an exact match isnot found, checking against the database for a word that may have beentyped with an error (using a spelling correction algorithm); (ii.d) ifthe word is in the knowledgebase thesaurus, remember its word groupname’ and remember these two alternative representations (the word andthe word-group); (i.e) look this word up in the general languagedictionary. If it does not exist or if its corpus popularity is verylow, it will signify that this word might have been misspelled and aspelling correction search would be done to look for a more probableword in the dictionary.

At the end of the above process, the algorithm will have, for eachprocessed word, a list of candidate basic information units. Some of theabove sentence processing steps can be used depending on the programmingresources in hand—exemplary implementations can be found on many bookand papers in the field of Natural Language Processing (NLP). Even ifone resorts to the simplest implementation that is to store the originalunstructured text 17 as structured knowledge 18 with minimalintervention—even then—the system can work properly but it will requiremore discipline from the KM 11 so that he will input information in aconsistent and simple form.

According to an embodiment feedback unit 16 can provide to the KMfeedback that eases the input of information. Feedback To aid KM 11 ininputting consistent information—such that he does not repeat himself;can see what related information is already stored; remove un-importantparts of the sentence; correct spelling errors and the like—FeedbackUnit 16, feedbacks him in real-time as he types with all sorts ofsignals and suggestions as described on FIG. 3 or 3 a.

Additionally, KMA 12 can aid the KM 11 by showing him the proposedconversion to structured knowledge 18 and enable him to accept or changethe representation. In some simple cases, the conversion mechanismsmentioned above can let the computer go over information and convert it,with minimal or no KM 11 supervision. In many cases an automaticconversion would produce insufficient results, and a semi-automaticmethod (that includes multiple iterations of exchange if information)can be applied.

Once a structured knowledge 18 is built it is stored in knowledgedatabase 13 for later usage. If the structured knowledge 18 is astatement-answer pair, then the answer can be stored as it is—inunstructured form—and only the statement needs to be converted tostructured form 18 since this is the part that we want to match againsta the user input.

Converter to structured form 15 can provide a structured-form (alsoreferred to as a structured representations of answerable statements)that can be a concise version of the sentence. It is noted that the KMcan be requested to try to use as few as possible words when adding anew piece of information. Thus, as few basic information units shouldrepresent an answerable statement and a response to that answerablestatement.

It is noted that such representation of answerable statements orresponses requires no programming skills or complex data structureunderstanding in order to add knowledge, and the hard work of adding theknowledge at the proper point in the database, is spared from the KM.

Converter to structured form 15 takes all the basic information unitsobtained from the sentence processing module 14, and creates one or morestructured representations of answerable statement.

For each of the above candidate basic information units, there will bean importance-weight associated with it. This weight will be determinedfrom the word's properties as stored in the Knowledge Database (i.e.stop-words would get a very low weight, semistop words would get amedium weight, and other words would get a high weight or something thatwill depend on their popularity or importance in the database). Theweight can also be altered by the word's position and grammaticalfunction in the original unstructured text (i.e. if a language parser isused then the weight of the subject and verb can be higher then theweight of auxiliary or main-sentence modifiers.). The word weight canalso be determined or altered by the KM itself before or after he seeswhat the above algorithm has done using the feedback mechanism, or othermeans.

The converter's 15 outputs a list (or graph or other data structure) ofbasic information units that represent a natural language sentence. Andeach basic information unit has an importance weight, signifying itsimportance in the full sentence.

An example of a conversion to a structured form is provide below: (i) Auser can provide user input such as “I love it when you surprise me withspecial offers”; (ii) KM 11 previously provided a KM input—anunstructured concise natural language sentence or graph of words. “Ilike special offers” (after the KM has left only the crucial words, inthe process he also defined the terms “like” and “love” as synonyms inthe custom dictionary, if they haven't already have been defined in thegeneral dictionary as such, and he has added “special offers” to thelist of phrases)

Structured form of an answerable statement can include a combination ofone or more basic information units. In the above example, the internalrepresentation of the structured form will be: “C_I C_likeCspecial_offers” where the “C_” means that this is a basic informationunit object defined in the KD with all its associated properties(synonyms, importance weight etc, part of speech etc.)

Matcher 19

Matcher 19 receives structured data and can interact with an answerentity such as knowledge database 13.

After the user input (when responding to the user) or KM's input's (whenupdating or generating knowledge database 13) are converted tostructured form, the next step is to find the closest structured form'sthat are stored in KD 13. The brute force approach would go over all thestructured forms entries in KD 13 and compare the basic informationunits of them against basic information units in the user (or KM) input.According to another embodiment of the invention the KD 13 indexes thebasic information units and uses this index in order to access KD 13.This can involve applying hash function.

According to an embodiment of the invention a weighted comparison isconducted between basic information units extracted from user (or KM)input to basic information units associated with each of the multipleanswerable statements stored in KD 13.

A sample comparison is illustrated below. The following definitions areused: (i) Inp—the structure form the was converted from the User or KM'sinputs; (ii) Db—a structure form stored in the KD; (iii) Mu—the basicinformation units which are mutual to both Inp and Db; (iv) InpW, DbW,MuW—the sum of basic information unit importance weights in Inp, db, Mu

The comparison is based upon the assumption that the higher MuW/InpW andMuW/DbW the better the match. Multiplying these two terms will give agood measure of the fit with a max value of 1 and min value of 0.Improvements on the formula can include smoothing the division effectwhen DbW or InpW are low, or by using a sigmoid like function. And athreshold can be set to determine of the fit is excellent good orinsufficient.

Once the best matches have been identified, they are being sorted andoutputted to the next stage in the computation.

Feedback Unit 16

Feedback unit 16 can be used during the update or generation of KM 13and also when responding to user input.

During the update or generation of knowledge, the feedback unit 16 can(continuously or non-continuously) monitor the output of sentenceprocessing module 14 and converter to structured form 15 (as the KM istyping or inputting the knowledge) and present to the KM theintermediate or final results of these units.

So that If for example there are several options for which basicinformation unit to use to represent a certain word then feedback unit16 can send these options to KM 13 and let him choose, or shows him whatis the automatic choice. (i.e. if apple means a computer company basicinformation unit, a fruit basic information unit, or the specificcomputer company “apple”, or the specific fruit “apple”).

If for another example, a related or identical piece of knowledgealready exists in KD 13, feedback unit 16 shows this to the KM and hecan adjust delete or connect his newly added information to the existingone.

After the KM approves the structured from representation of hisknowledge, the structured form as well as the unstructured form aresaved in the KD for future retrieval by the interaction application.

This can be useful for electronic devises with small screen—such ascellular phones, and the picking from the list could preferably be doneby saying “one” “two” . . . etc, and using a simple speech recognitionmechanism

FIG. 2 is a block diagram of an illustrative system and method forretrieving answers in respond to user inputs. One or more users 20communicate with the interaction application 21. The interaction isbidirectional—the user asks and supplies information. And the computer(through the) asks and supplies information.

Additionally, in the present invention there is another type ofinteraction between computer and User 20—it is in the form of feedbacksthat the Interaction Application 21 gives to the user regarding theUser's 20 inputs. This helps and guides the User 20 as he types, to seewhat the computer does or does not knows and understand. More to bedescribed later on FIG. 3-3 b. The Interaction Application 21 processesthe User 20 input, in a similar way as the Knowledge ManagementApplication 12 did, with the goal of transforming the User Input into astructured form After being transformed to structured form, Matcher 19matches up the User's 20 inputs against the inputs that are stored inthe Knowledge Database. The best matches that are found are sorted andranked and an answer is produced by the Response Creator. The responsemay be a straight answer, or it can involve running a NL Script,whatever response was defined by the KM at the time of knowledgecreation. The response is supplied back to the User 20 in the form oftext graphics sounds etc.

The interactions are preferably logged and stored by interaction logger22 for later analysis. One important usage of the Interaction logger 22is to alert the knowledge managers 11 on unanswered or misunderstoodconversations with user 20—thus enabling knowledge mangers 11 tocontinually extend the knowledge stored on the system from user 20conversations.

At certain applications it may be beneficial to have a humanrepresentative 23 communicating with users 20. Such that difficultstatements or special issues are resolved by human representatives 23,while simple statements can be answered by the computer. The advantageof this over full human service is by lowering the costs of answeringsimple statements. In these cases, interaction application 21 can chooseto direct users to Human Representatives 23 according to some criteriasuch as: user profile, user statement/statement. These redirections tohumans can be stored in the Interaction Log 22 and later be analyzed inorder to improve the system and reduce the need to direct to humans.Interaction application 21 can send a request for human intervention tothe human representative and get their response.

Interaction application 21 can include visual aids such as a static ordynamic pictures such as a talking human. This can enrich the user'sexperience and give him the feeling that he is talking to a human andnot a computer

FIG. 2A is an illustrative block diagram of the inner workings of theinteraction application 21 according to an embodiment of the invention.

User 20 communicates (provides user input) either by providing textinformation or by using speech that is converted to textual informationby a speech recognition unit 24.

Speech recognition unit 24 and speech synthesis unit 25 can provide theneeded translation. As of today, Speech Synthesis 25 has reached a goodlevel of technological maturity and can be used successfully totranslate computer's text response to speech. Commercial SpeechRecognition 24, however, shows worse results and thus for the presenttime it is recommended to stick to text communications from the Userside where possible. An alternative possibility is to improve oncommercial Speech Recognition products by integrating them with oursystem in such a way that they will use the Knowledge Database 13 toreduce speech recognition ambiguities by checking each speech ambiguityagainst its compatibility with language and knowledge rules, thuscanceling un-probable sentences.

The user input is processed by sentence processing module 14, theconverter to structured form module 15, and matcher 19, similar to theway it was done in the context of the KMA, only that this timeambiguities will not be presented to the user as they were presented tothe KM, so if for example the word “apple” is used by user 20 (isincluded within user input), the converter to structured form module 15would have to test all the meanings of the word (fruit, softwarecompany, . . . ), and try to rank them according to frequent usage orconversation, and let the response creator to—either choose the bestone, or present them to the User for him to choose.

User 20 does not necessarily inputs his user input in simple andconsistent way, as KM is expected to do, but matcher 19 performs weightsbased comparison, the weights being provided, for example, by converterto structured form module 15, and irrelevant language words have asmaller effect then keywords (basic information units of importance),thus allowing for good matches to be made nonetheless.

Before the user input is matched against general knowledge databaseentries, it is matched against a subset of the knowledge database,wherein the subset can be selected in response to the context of theconversation. This selection of the database subset can be done bycontext handler 26.

Response Creator 27

One response to an answerable statement involves providing a responsefrom knowledge database 13 and just send it to user 20. Yet anotherresponse also includes not just a list of best-matching structured formsbut also their match metric. Yet a further response includes sending tothe user a single response (for example—a single answerable statement)if an excellent match exists—if a matching value exceeds a firstthreshold of is exceeded (match level>ExcelentThreshold). Anotherresponse can include multiple good matches—if their matching valuesexceed a second threshold but do not exceed the first threshold (matchlevels>GoodThreshold). In this case these answerable statements aresuggested to the user to choose but don't immediately show theirresponse. If no good matches are found, the response creator 27 canraise an event to the behavior unit (28) that in turn either outputs an“I don't know” type of answer or produces a behavior that tries tocommunicate with the user and better understand what he wants.

Conveniently, the response creator 27 can include dynamic contentcreating i.e. using dynamic information such as the user name, in theoutputted response.

Conveniently, the interaction system offers the user choice (such aswhen there are a few possible completions, or when it is not sure whatthe user meant) and the User is making a choice—is an opportunity forthe system to improve over time, by keeping records of what users arepicking (and give it higher rank in the future) and what they are notpicking (and give it lower rank). These records of what users arepicking are a non limiting example of selection metadata. Selectionmetadata affects the selection of the answerable statement response

Interaction Logger 22

The interaction logger records the conversations with Users. Therecording has several important usages: (i) User interactions thatyielded no answer (identified either when the matcher does not find agood enough match, or when the User expressed his dissatisfaction bysaying or pressing a ‘I am not satisfied’ link) are marked and presentedto the KM In his next interactions with the KMA. Sometimes the user issaying something in the middle of an NL script. In this case the KMAwill link the relevant point in the NL script to this problematic log,and the KM can later add or update the NL script accordingly. (ii) Formarketing and support analytics: identifying areas of difficulties, orinterest. This is done by storing the usage frequency of a certainstructured piece of knowledge and analyzing it's trend over time. (iii)To be stored together with all other user communications in the CRMsystem, to be used later either by a human representative or by theInteraction Application itself for continued support. (iv) Presentingunanswered or poorly answered user inputs so that a KM can see them whenhe works on their relevant basic information units or relevant naturallanguage script This would allow the KM to quickly improve the system:add missing knowledge and for easy improvement in the KMA. The detectionof such user inputs would be done by identifying user actions such as:pressing a ‘that's not what i meant link’, or saying something like “Idon't understand”/“I already tried that”—all sentences which are storedin the Knowledge Database in structured form and are identified just asany other sentence is identified.

The nature of many interactions such as customer support interactions isthat a User asked an initial statement or states a problem or symptom,and the Agent identifies the issue from all the knowledge base contentand either 1. Gives a direct answer or 2. starts a flow-chart likeprocess of asking the User for additional details and guiding himthrough the process according to his answers. These flowcharts likeprocesses can conveniently implemented using NL Scripts as will bedescribed.

After this handling the structured knowledge (structured representationof user input that can include one or more basic information units) 18is compared with stored pieces of knowledge (basic information unitsrepresentative of answerable statements) in knowledge database 13, andfeedbacks are sent by feedback unit 16 to user 20 regarding how thecomputer understood his sentence, and what the computer can answer(answerable statements) and can not be answered. When user 20 finisheswriting/talking and optionally updating his sentence, respond creator 27fetches the most appropriate response (such as an answering entityresponse) from knowledge database 13 and sends it back to user 20.

At some time it may be appropriate or helpful for the computer toinitiate a conversation such as trying to sell something to the User 20,or asking for contact information. Behaviors Unit 28 is responsible toinitiate such conversations

If conversation logs are displayed such that historic user inputs andsystem outputs are not erased from the screen and can be reviewed by theUser, then the User can scroll back in the conversation log, and maketry different choices then what he has made. The system would them jumpto the point in the conversation, where this option has been presentedto the user, and continue from there. A convenient way to implement thisis to store in memory for each possible conversation re-entering point,the conversation state—such as the context handler's state and the NLScripts state.

This is especially useful in Natural Language Scripts, that diagnose aproblem by asking a user to make some checks and to answer somestatements; if the user is, along the process, discovering that he hasmade a bad choice, he can go back in the conversation log, and correcthis choice. This would be much easier then saying to the system“remember when you asked me what firewall I have, and I said that Idon't have it, well I just discovered that I DO have a firewall”—whichis a also a very hard sentence to understand.

Context Handler 26 can perform the following stages: (i) look in thesession memory and check if the latest engine response has a specialcontext defined in it; (ii) a special context means an area of theKnowledge Database that belongs to a NL Script command such as Multicommand. A multi command is an example of multiple knowledge databaseentries that form a data structure.

For example, in the case of a NL Script for example, if the previouscommand that ran was Say: “please disable security settings” then acontinued entry to it may be the statement answer pair: {“why?”,“Because it's necessary to in order to continue, but don't wary we'llchange it back when we're done”}.

Yet for another example, when the interaction application wants toclarify what the user meant by “what is apple”, since there are two suchstatements in the knowledge database, then a temporary NL script iscreated and run by the response creator. That process would first: say“did you mean: 1. apple the computer company, or 2. apple the fruit.”,then it point wait for a response and interpret it on the specialcontext of: {input=“1” or =“computer” or =“company”, output=link to theanswer of “what is C_apple_computer_company”} and similarly for thefruit response.

If, for example, a special context is defined, then Matcher 19 can giveprecedence to database entries in this context, over database entries inthe general context, so that if two similar entries exist—one in specialcontext and the other in the general context—then the one in the specialcontext is being chosen.

Another role of the context handler 26 conversation is that when aconversation is spanned over a specific topic, context handler 26signals Matcher 109 to assign a higher weight to basic information unitsthat appeared in the preceding dialogue.

Session Memory 29

Session memory 29 logs current conversations with each specific user 20,so that the context handler can check a user's input against therelevant conversation context. If a NL script was activated, it alsologs the specific command that was run—enabling to interpret the nextuser input in the context of that command.

Behavior Unit 28

The inputs to behavior unit 28 are special events that are raised by theother units. Such as when matcher 19 did not find an appropriateresponse (an answerable statement) to the User's input. Or when the Userclicks some link in the webpage, or when the User has asked a specificquery. All these events were conveniently predefined by KM 11 when he isadding knowledge, and they are stored in conjunction to the relevantdatabase entry in the Knowledge Database

Behavior unit 28 can include a list of conditions how to act when itreceives these events. A rule for example can be: “if you receive 3times in a row a signal that the matcher cannot find a proper answer;run a NL Script that apologizes to the User and asks him if he wants tosubmit his query for a human representative”. The behavior unit candynamically create and run a NL Scripts or commands in response to someconditions or events.

Behavior unit 28 can be programmed to try to optimize some goal—such asthe raising a user's interest and want to buy a certain product. Thebehaviors can include changing the computer responses according to thecurrent “Computer Mood” that can be defined as a measurement of thesuccess of the conversation, or politeness or rudeness of the User asdetermined by usage of bad language words.

If a user keeps asking or saying something that the system has no goodresponse to, then the system can suggest him to send this problem foranalysis by human (request human intervention). If he chooses, he candescribe his problem and his feedback is stored and later shown to theKM that is maintaining this part of the knowledge database. The systemcan later try to contact the User (via email or via next time he logsinto the interaction application) and update him on the progress of thisissue. If more User ask a similar such issue in their conversations, thesystem can know that this is an important issue, give more importance tothis issue, and let them know that this problem is being dealt with andthat they too could be contacted when it is solved. This mechanism canbe very useful for technological products that bugs or compatibilityissues arise with them after the product has been launched and after andwhile the users have already bought and use them.

Recognizing such an new issue can be done by maintaining a list ofunknown words—words that user is using but the system does not know, anda list of not-understood input, and the context which they appeared (theconversation log), such that when an unknown word or a not-understoodinput is repeat the system starts this behavior.

Feedback unit 16

Feedback Unit 16 is used in order to facilitate the natural languagecommunication between a computer and a human.

When a human converses with a computer in natural language the computerunderstands only part of what the human says. Among the many reasons forthis partial or misunderstanding are: knowledge was not stored in thecomputer; User's statement is too complex, specific or involves unknownwords, difficult grammar or sentence structure, misspellings etc. Ourdisclosed Feedback Unit 16 solves most of the above misunderstandingproblems and others.

An aspect of feedback unit 16 is described in FIG. 3.

A human (can be a User 20, a Knowledge Manager 11 or other) isinputting, usually by typing, a statement, a portion of a statement, aresponse to a request to receive answerable statement selectioninformation or a statement into the Input Box 31. As the human types,feedback unit 16 is continuously trying to predict what the human istrying to write or ask, and suggests it to him in the Suggestions Box32. Sometimes there are many ways to complete a word or a sentence to aproper sentence that is stored in the Knowledge Database; in this casethe feeback Unit takes these possible matches and groups them togetherso that the User is not being presented by too many options. Examplesfollow. The highly probable suggestions will be positioned in a morevisible way than others (for example higher in the list or with a bolderfont), and related suggestions can be grouped. If the Feedback Unit 16does not find a good match between what the user input and especiallybasic information units representative of the user input and between theknowledge in the Knowledge Database 13, it suggests according to somelogic, the closest pieces of knowledge that it can find (for exampleanswerable statements or portions of answerable statements). The humanobserves, as he types, the suggestions in the Suggestions Box 32, andadopt his sentence or statement according to the suggestions. By doingso, the human saves time and effort, since he is not phrasing a complexsentence only to find out that the computer does not know how to answerit. Example 1 in FIG. 3 demonstrates the above. The “|” sign in theInput Box 31 signifies the cursor position when typing. In step 1.1 thehuman is writing “How can”, and gets two suggestions “How can I.” and“How can you.”. The suggestions are provided due to their pastpopularity or since answerable statements in the Knowledge Databasestart with these words. In step 1.2 the human chooses—“How can I”(either by typing or by means such as mouse or by designated keyboardkeys) and the computer updates the suggestions to “How can I receive . .. ” and “How can I send . . . ” and “more . . . ”. The “more . . . ” isused to designate that there are more possible completions to the usertext, but they are not show so as not to overload the human, but theuser can, by choosing “more . . . ”, see these extra suggestions behindit. In step 1.3, the human types ‘o’ and the computer updates thesuggestions to words that start with the letter ‘o’. And finally in step1.4, the human chooses “how can I open an account”, sends his request(by the “enter key” or mouse click for example), and passes the finalrequest to subsequent systems (to KMA 12, to the Interaction Application21, or to any other process). By going through this process the user isguaranteed that an answering entity will be able to respond to theuser's input. Without performing this iterative process, an answeringentity (in cases where the user input does not match an expected input)would not be able to answer the statement. In that case the answeringsystem would have responded by stating that it doesn't have the usertext, or by asking for clarifications. The human would have needed toanswer this clarification, or to post a slightly modified query, makingthe whole process slow, cumbersome and ineffective from the humanperspective.

Any time the system (or method) offers the user choice (such as whenthere are a few possible completions—few answerable statements (or theirportions) that can at least partially match the user input—or when it(the system or method) is not sure what the user meant) and the User ismaking a choice—is an opportunity for the system to improve over time,by keeping records of what users are picking (and give it higher rank inthe future) and what they are not picking (and give it lower rank)

In FIG. 3A, Example 2, Step 2.2 a human misspells the word “email”. Thecomputer signals the possible error by some kind of mark on the worditself or elsewhere and either automatically corrects, or suggests acorrection to the misspelling.

In Step 2.3 even though the humans statement is clear to the answeringsystem the user can still be provided with possible refinements on theuser's statement that might be helpful to the user.

In step 2.4, the user has asked a specific statement with the phrase “tothe moon” that is not understandable to the computer. The computersignals to the user that this phrase is not understandable to him by,for example, strikethroughs on this section and suggests alternatives.By seeing this signal the human understands that the specific statementhe asked cannot be answered by the computer but that the more generalstatement “can I send emails”, and the other suggestions, can beanswered. This saves the human and computer the need to go through aconversation such as: “I don't know if you can send emails to the moon,but I can answer to you if you can send emails”. Notice that thecomputer is not restricted to suggesting sentences that strictlycomplete the human input but rather any related sentence can bepresented. And the differentiating or similar words in the suggestedsentences can be highlighted or otherwise marked for easier humanreadability.

In example 3, steps 3.1 and 3.2, the human is inputting the keyword‘email’. The Feedback Unit 16 is suggesting a WH-statement about‘email’, a phrase such as ‘email password’ and a recurring word-pairsuch as ‘sending email’. In step 3.3 the human is choosing ‘receivingemail’ and the computer suggests statements such as ‘how to receiveemail’, and an extended phrase such as “receiving email from the web”.In the mentioned examples, the Feedback Unit 16

Feedback Unit 16 is conveniently resistant to language and conceptualpermutations. A user can ask the same statement in many different ways,and the Feedback Unit 16 will treat all these as the same basicstatement. This differentiates our invention from standard auto-completesystems that merely complete a sentence according to its beginning. Inour Feedback Unit 16, if a human writes “I would like to know about X”,the beginning words would either be disregarded and the sentence betransformed to “X”, or better of, the sentence would be transformed to“what is X”. Another example is that if a human writes “I would like toknow the location of X”, then the computer will transform it to “whereis X” and feedback on it. The above mechanism can be implemented eitherby using a table of language pattern transformations, or by omittingwords and phrases that are not specific and focusing on the keywords.Another example is handling of synonym words and word transformations.So that if “to image” and “imaging” and “to picture” can be used by ahuman and the suggestions, if appropriate, would be similar. And inorder to make things clearer to the human, suggestions can match hischoice of words, either “to image in dark”, “imaging in dark” “topicture in dark” respectively. The above can be implemented by usingword stemming and by using a custom or general purpose thesaurus.

In order to make the list of suggestions shorter and thus easier for theuser to read through, feedback unit 16 can use the conversation state,conversation context, statement frequency, and user profile. From thatinformation, feedback unit 16 can predict better how to complete oradjust the user statement. Additionally, the computer can learn whatsuggestions users like best for this text, and adopt its suggestion listwhen making this same suggestion in the future.

FIG. 3B is an illustrative flow chart of the Feedback Unit 16. Typedinput (user input) 33 is processed for language words, keywords, unknownwords, grammar, language patterns and sentence structure, by theprocessing units (Sentence Processing 14, Context Handler, Converter toStructured Form, Matcher) and compared with available knowledge in theKnowledge Database 13. In the next stage 34, suggestions are beingcreated and ordered according to relevancy and are being backwardtransformed from structure to unstructured text that looks as much aspossible similar to the way the User expressed his query. Thisconversion means converting a basic information unit to the specificword that the User used, or converting a basic information unit oflanguage such as “C_What_Is” to the specific User words may it be “tellme about” or “give me information on” or “define”—all synonyms phrasesin the Knowledge Database.

In the case where there are many possible suggestions they are beinggrouped 35 to not overwhelm, the user, and are being presented to thehuman in the Suggestions Box 32. The grouping reflects that multipleanswerable statements are associated with each other. The next stagedepends on the user—if he continues to type, then whole processcontinues, if he accepts (sends an acceptance indication) a suggestion(an accepted answerable statement) then the Input Box 31 is updated, allthis until he finishes writing and wants the system to react.

This grouping mechanism can also be used in the response creator 27, inwhich case it would be translated to a natural language script thatasks: “are you interested more in 1. Group1, 2. Group2, or 3. Group3”,where instead of writing Group1 the common basic information unitsbehind this group would be presented.

The feedback mechanism is active all throughout the User's Inputprocess. It can continuously (or non-continuously) monitor the output ofthe sentence analyzer and structure form converter (as the User istyping or inputting his statement or statement) and shows the User theintermediate or final results of these units. In the form that isdescribe more fully in FIGS. 3, 3 a, 3 b.

This can be useful for electronic devises with small screen—such ascellular phones, and the picking from the list could preferably be doneby saying “one” “two” . . . etc, and using a simple speech recognitionmechanism

Similar guidelines as described above can be used to implement afeedback mechanism for users who use speech as input. In this casespeech recognition and possibly speech synthesis converters will beadded to the scheme. It is known that speech recognition is not accurateenough to fully translate user's voice into text. But, by integrating itwith our Feedback mechanism, a human would be able to use these systemswithout being so frustrated by their low recognition performance. Theway it would work is that the feedback mechanism will present to theuser on the fly a list of queries and the user will choose among them.This would allow the user to communicate with the computer withouttyping, rather by using his voice and possibly pointing device, whichcan be more convenient in some scenarios such as with smalldevices—PDAs, Cell phones.

Responding to the User

The nature of many interactions such as customer support interactions isthat a User asked an initial statement or states a problem or symptom,and the Agent identifies the issue from all the knowledge base contentand either (i) Gives a direct answer or (ii) starts a flow-chart likeprocess of asking the User for additional details and guiding himthrough the process according to his answers.

The direct answer situation is handled by our statement-answer pairs

The statement part is stored as structured form, and the answer part isstored as is in unstructured form. The statement part should includemultiple different ways of expressing the same idea. For example: “howto see what I have sent” “where is the sent-items folder” “how to find amail I have sent”, but it can sometimes be effectively shrunken byadding synonyms instead of adding different ways of saying.

Natural Language Scripts

Flow chart like processes can be managed by Natural Language Scriptsdefined below. (Natural Language Script is also referred to as semi-openconversation method).

A Natural Language Script (NL Script) is a statement-program pair. Theprogram is a sequence of simple commands.

FIG. 4 illustrates a command 100 according to an embodiment of theinvention.

A knowledge database entry includes an expected user statement field andat least one action field. Multi command 90 is an example of multipleentries of the knowledge database that form a data structure thatincludes multiple expected user statements fields (such as the multiple“statement” fields included within each row of multi command 90) thatmatch an expected sequence of user textual inputs. Conveniently, atleast one action field such as the “Say” field, includes through the“NextCmd” field a link to another knowledge database entry (that can beidentified by its ID value) that includes another expected userstatement field and at least one other action field. The commands withinthe Multi command are linked to each other. A user can be provided witha graphical representation of these commands, whereas the graphicalrepresentation includes the various links.

Referring to FIG. 4, a user is expected to provide a first statement(such as the statement included in the statement field of “Multi”) afterwhich the Multi command will present to the user the Multi command's“Say” field content, and then the user is expected to provide one ormore statements that are included in the statement field of either oneof MultiItem1 or Multiitem M).

Multi command 90 may include one or more MultiItems commands(90(1)-90(M)), and it can be used to manage multiple responses thussimplifying the task of the KM.

A multi command run's either when it is called by another command, orwhen the User's input has matched its one of the structured forms storedin its ‘statement’ field.

When a multi command is run, the application outputs (responds by) its‘say’ value (this statement can be an answer or a question to the user),and stores a link of itself in the Context Handler 26. Next time theUser inputs something, the Context Handler returns to the stored Multiand checks if the User's input matches against any of the MultiItemstatement field. If a match is found, the relevant MultiItem starts anddisplays its ‘Say’ field's content.

NextCmd field can contain a ‘goto (id)’ statement or ‘call (id1, id2)’statement—which is equivalent to “goto (id1) and when finished goto(id2)”. If a multiitem has something in its NextCmd field, then thisNextCmd is executed when the MultiItem finishes.

A multiitem is also stored separately in the KD and can startindependently when its ‘statement’ field matches a User input,regardless if its parent Multi command was activated or not.

The ‘DisplayedAs’ and ‘DisplayOptions’ fields are used for cases wherethe KM wants to present the Multiitems as options for the user to choose(such as with radio buttons GUI), the displayedAs field controls how themultiitem will be displayed as, and the DisplayOptions determine if,when and how to display it. (i.e. display when multi run, or when userresponse to the multi is such that it is clear he needs help in makinghis choosing).

Two additional commands that can be useful too are “input” command thattakes something the user has said and stores it in some variable tolater be used. And an “if” command, that compares a variable's contentwith some value and acts upon it.

The NL Scripts can be displayed in a table as exemplified here, orvisual graph where the nodes are the commands and the links are the‘nextcmds’. The later can be easier to handle when the Scripts becomelarge.

It is noted that each row of the table can be stored in a single entryof the knowledge database. The “statement” field can be regarded as theexpected user statements field of the knowledge database entry whileeither field out of “say”, “DisplayedAS”, “Display options” and“nextCmd” can be regarded as action information.

Table 1 illustrates a sample multi command according to an embodiment ofthe invention.

Command Displayed Display Type Id Statement Say As Options NextCmd MultiA My Ok, did — — — camera you turn isn't it on? shooting picturesMultiItem A1 Yes Ok. Yes Show Goto(B) MultiItem A2 No Ok, turn it NoShow End on and then try to shoot pictures. MultiItem A3 I don't To turnHow to Show Goto(A) know/ on the turn on how to camera camera press thebutton marked in the figure to your right Multi B — What — — — happenswhen you try to shoot pictures? MultiItem B1 My Your The Show camerabattery is camera turned of empty. turns by itself. Please off chargeit. MultiItem B2 Nothing Try Nothing Show Goto(B) happens again, Happensthis time press the button harder

Table 1 can enable the following conversation:

User: I can't shoot pictures

System: Did you mean to say: “my camera isn't shooting pictures” (sincethe match is not exact, the system asks)

User: yes

System: ok, did you turn it on?

User: of course (“of course” is a general sysnonome to “yes” so it isunderstood).

System: What happens when you try to shoot pictures?

User: I hear a strange noise.

System: I don't know about this, choose from:

-   -   a. The camera turns off    -   b. Nothing Happens

User: that's not what happened. (this user input evokes an event of usernot satisfied)

System: I can't offer further help on this. Would you like me to sendyour problem for further analysis, and to contact you when a solution isavailable?

User: sure

System: ok, please give your email address and we'll get back to youwith further recommendations. (The system saves the unidentified input“I hear a strange noise” together with the exact context it happened (asan answer to “What happens when you try to shoot pictures?”), and thisincident is review and the knowledge gap can be filled by a the KM.)

FIG. 5 illustrates method 200 for providing a response to a statement ofa user, according to an embodiment of the invention.

Method 200 starts by stage 210 of receiving user input that includes aportion of a user statement.

Stage 210 is followed by stage 220 of selecting, before receiving thewhole user statement, an answerable statement response. The answerablestatement response can be selected out of an answerable statement,multiple answerable statements or a response to an answerable statement.The selecting is responsive to user input and to structuredrepresentations of answerable statements answerable by an answeringentity.

Stage 220 is followed by stage 240 of sending to the user the answerablestatement response.

If the answerable statement response includes the response to ananswerable statement than stage 240 can be followed by stage 210.

Else, stage 240 is followed by stage 250 of receiving a user response.

Stages 220-250 can continue until receiving an acceptance indicationfrom the user indicative of a user acceptance of an answerablestatement.

It is noted that during stage 250 the user can change the previouslyinputted portion of user statement or provide another portion of a userstatement, can select between multiple answerable statements sent to theuser during stage 220, can respond to a request to receive answerablestatement selection information, or can send the acceptance indication.

Conveniently, method 200 can receive one portion of the user statementand respond by sending to the user one or more answerable statements,then receive another portion of the user statement and respond bysending the previously sent one or more answerable statements or sendother answerable statements.

Conveniently, when multiple answerable statements are presented to theuser they may include answerable statements that at least partiallymatch the user input. Thus, answerable statements can be groupedtogether to form answerable statement groups. Each group includesanswerable statements that are associated with each other. Thisassociated can exceed a predefined association threshold.

Conveniently, stage 250 can include receiving an audio acceptanceindication from the user. This audio acceptance indication can confirm(“approve”, “accept”) a single answerable statement displayed to theuser or can select (“the first option”, or “one”) between multipleanswerable statements displayed to the user.

According to another embodiment of the invention a user can receive anaudio indication representative of one or more answerable statements.

Conveniently, stage 220 of selecting includes performing a weightedcomparison between basic information units extracted from the user inputto basic information units associated with each of the multipleanswerable statements. It is noted that the weighted comparison can bepreceded by searching an entire answerable statements data structure(for example the whole knowledge database) or just a portion thereof.

Conveniently, multiple iterations of stages 220-250 can occur during asingle session of a typing of a single user statement. A typing of anadditional word or of few additional symbols can trigger a newiteration. These iterations can occur in real time or nearly in realtime.

For example, two iterations of stages 210-250 can include: receivinguser input that includes a first portion of a user statement; selectingan answerable statement response between an answerable statement,multiple answerable statements and a request to receive answerablestatement selection information; wherein the selecting is responsive tothe user input and to structured representations of answerablestatements answerable by an answering entity; sending to the user theanswerable statement response; receiving user input that includes asecond portion of a user statement; selecting an answerable statementresponse between an answerable statement, multiple answerable statementsand a request to receive answerable statement selection information;wherein the selecting is responsive to the first portion and to thesecond portion of the user statement; sending to the user the answerablestatement response and receiving an acceptance indication from the userindicative of a user acceptance of an answerable statement.

Stage 250 is followed by stage 260 of sending to the answering entityinformation representative of the accepted answerable statement. Thisinformation can include one or more basic information units.

Stage 260 is followed by stage 270 of receiving from the answeringentity the answering entity response. The answering entity can be, forexample, a knowledge database that can be accessed by an interactionapplication.

Stage 270 is followed by stage 280 of sending to the user informationrepresentative of the answering entity response. Conveniently, theanswering entity sends one or more basic information unitsrepresentative of an answer. Stage 280 include (or is preceded by)converting these basic information units to an answer that includesadditional information, alternative information and the like.

According to an embodiment of the invention stage 220-250 do not resultin a provision of an acceptable response. Thus, a user is not presentedwith a good enough answerable statement or the answering entity responseis not acceptable. The user can indicate that an unacceptable responsewas received (for example—by sending a dissatisfaction message) or themethod can determine that such a problem occurred—especially if thenumber of iterations of stage 220-250 exceeds a certain threshold.

Method 200 and specially stage 220 can include utilizing (for example byaccessing and processing) a knowledge database entry that includes anexpected user statement field and at least one action field. Multicommand 90 is an example of multiple entries of the knowledge databasethat form a data structure that includes multiple expected userstatements fields (such as the multiple “statement” fields includedwithin each row of multi command 90) that match an expected sequence ofuser textual inputs. Conveniently, at least one action field (such asthe NextCmd” field) includes a link to another knowledge database entry(that can be identified by its ID value) that includes another expecteduser statement field and at least one other action field. The commandswithin the Multi command are linked to each other. A user can beprovided with a graphical representation of these commands, whereas thegraphical representation includes the various links.

Conveniently, method 200 includes stage 290 of storing at least aportion of the information that was exchanged during stages 210-280.This information (and especially previous answerable statements sent tothe user) can be displayed to a user (as illustrated in stage 300) inorder to enable the user to alter a previous selection he made. Stage300 conveniently includes presenting to the user multiple answerablestatements that were sent to the user and resulted in an acceptance of acertain answerable statement by the user.

Accordingly, stage 300 can be followed by stage 250. Stage 250 caninclude receiving an acceptance indication from the user indicative ofan acceptance of another answerable statement out of the multipleanswerable statements.

Conveniently, method 200 further includes stage 310 of updatingselection metadata in view of at least one response of at least one userto at least one answerable statement response. The selection metadataaffects the selection of the answerable statement response. Suchmetadata can be the number of times that users have accepted ananswerable statement relative to number users have accepted otheranswerable statements for similar or related user inputs.

Conveniently, the method includes applying natural language scriptsduring the selecting of the answerable statement.

Conveniently, the method includes selecting a single answerablestatement if the single answerable statement and the user input arecharacterized by a matching value that exceeds a first threshold andselecting multiple answerable statements if each of the multipleanswerable statements and the user input are characterized by a matchingvalue that exceeds a second threshold but is below the first threshold.

The multiple answerable questions can include answerable questions thatat least partially match the user input.

Conveniently, the method includes presenting to the user multipleanswerable questions that were sent to the user and resulted in anacceptance of a certain answerable question by the user; and receivingan acceptance indication from the user indicative of an acceptance ofanother answerable question out of the multiple answerable questions.

Conveniently, the method includes: receiving user input that comprises afirst portion of a user question; selecting an answerable questionresponse between an answerable question, multiple answerable questionsand a request to receive answerable question selection information;wherein the selecting is responsive to the user input and to structuredrepresentations of answerable questions answerable by an answeringentity; sending to the user the answerable question response; receivinguser input that comprises a second portion of a user question; selectingan answerable question response between an answerable question, multipleanswerable questions and a request to receive answerable questionselection information; wherein the selecting is responsive to the firstportion and to the second portion of the user question; sending to theuser the answerable question response; receiving an acceptanceindication from the user indicative of a user acceptance of ananswerable question; sending to the answering entity informationrepresentative of the accepted answerable question; receiving from theanswering entity the answering entity response; and sending to the userinformation representative of the answering entity response.

According to an embodiment of the invention stage 210 is preceded bystage 100 of generating a knowledge database of an answering entity byconverting knowledge manager input into a structured representation ofthe knowledge manager input. Conveniently, stage 100 includes providingto the knowledge manager input feedback information indicating asuggested knowledge manager input.

According to various embodiment of the invention stage 100 can beapplied on knowledge manager input in an almost analogues manner asother stages of method 200 are applied on a user input. The maindifference stems from the fact that during stage 110 answerablestatements can be defined while during other stages of method 200answerable statements were already defined. For example, stage 100 caninclude responding to textual and/or audio input from the user.

According to another embodiment of the invention stage 220 can alsoinclude selecting an answer to an answerable statement. In this casestage 220 can be followed by stage 240 of sending to the user the answerto an answerable statement and skipping stages 260-270. It is noted thataccording to another embodiment of the invention the answering entitycan include the intermediate entity. In this case a single entityperforms these multiple stage of method 200.

According to an embodiment of the invention method 200 includescomparing the user input to a data structure that includes multiplecommands, each command comprises: (i) an expected user statement fields;(ii) a command identification field; (iii) action informationrepresentative of an action to be executed; (iv) next command to beexecuted field.

It is noted that the action information can indicate to send an answerto a user answerable statement, to send to a user one or more answerableresponses and the like.

Such a data structure can represent a flow chart that includes multipleexpected actions and responses.

Conveniently, the information representative of the response to the userstatement resembles the user statement. Thus, information that is send(and eventually presented to the user) can resemble the statement of theuser in the form of choice of words and sentence structure.Conveniently, this resemblance is aimed to ease a comparison (done bythe user) between users statements and the user input.

FIG. 6 illustrates method 400 according to an embodiment of theinvention.

Method 400 starts by stage 410 of receiving a user textual input. It isnoted that the user input can be a user statement. It is further notedthat the user can input a textual input but can also provide audio inputthat is converted to textual input.

Stage 410 is followed by stage 420 of matching a structuredrepresentation of the user textual input against expected statementfields of knowledge database entries. The knowledge database entryincludes an expected user statement field and at least one action field.Multiple entries of the knowledge database form a data structure thatcomprises multiple expected user statements fields that match anexpected sequence of user textual inputs.

Conveniently, at least one action field includes a link to anotherknowledge database entry that comprises another expected user statementfield and at least one other action field.

Stage 420 is followed by stage 430 of responding to the user in responseto the matching.

Conveniently, the method includes stage 440 of graphically displaying(to the user) links between multiple linked knowledge database entriesthat form the data structure.

Conveniently, an action field includes a flow control commands such asan “if” command, an else command, a call command, a goto command, or aninput command.

Conveniently, the method includes stage 450 of detecting a need torequest an intervention of a third party to respond to user input.

Conveniently, the method includes stage 460 of allowing a user to reviewprevious user inputs and previous responses and to choose to alter aprevious input or selection of the user and get an updated response.

Conveniently, the expected statement field comprises a natural languageresponse.

Conveniently, the expected statement field of a single knowledgedatabase entry comprises at least one concise ways of expressing asingle idea.

Conveniently, the expected statement field of a single knowledgedatabase entry comprises at least one synonym.

Conveniently, multiple knowledge database entries are represented byflow-chart like elements.

Conveniently, knowledge database entries are chained sequentially.

Conveniently, the method includes comprising detecting problematicknowledge database entries and indicating that they should be improved.

Conveniently, a method and computer program product are provided. Themethod includes converting knowledge to a computer usable format bybreaking up the pieces of knowledge to groups of independent anddependent ideas, including questions and answers about the knowledge,expressing these ideas in concise natural language statements andconnecting related statement in sequential form, so that an answer isconnected to a question, a question can be connected to a clarifyingquestion.

In an embodiment, the invention is implemented in software, whichincludes but is not limited to firmware, resident software, microcode,etc. Furthermore, the invention can take the form of a computer programproduct accessible from a computer-usable or computer-readable mediumproviding program code for use by or in connection with a computer orany instruction execution system. For the purposes of this description,a computer-usable or computer readable medium can be any apparatus thatcan contain, store, communicate, propagate, or transport the program foruse by or in connection with the instruction execution system,apparatus, or device. The medium can be an electronic, magnetic,optical, electromagnetic, infrared, or semiconductor system (orapparatus or device) or a propagation medium. Examples of acomputer-readable medium include a semiconductor or solid state memory,magnetic tape, a removable computer diskette, a random access memory(RAM), a read-only memory (ROM), a rigid magnetic disk and an opticaldisk. Current examples of optical disks include compact disk-read onlymemory (CD-ROM), compact disk-read/write (CD-R/W) and DVD.

A data processing system suitable for storing and/or executing programcode will include at least one processor coupled directly or indirectlyto memory elements through a system bus. The memory elements can includelocal memory employed during actual execution of the program code, bulkstorage, and cache memories which provide temporary storage of at leastsome program code in order to reduce the number of times code must beretrieved from bulk storage during execution. Input/output or I/Odevices (including but not limited to keyboards, displays, pointingdevices, etc.) can be coupled to the system either directly or throughintervening I/O controllers. Network adapters may also be coupled to thesystem to enable the data processing system to become coupled to otherdata processing systems or remote printers or storage devices throughintervening private or public networks. Modems, cable modem and Ethernetcards are just a few of the currently available types of networkadapters.

Conveniently a computer program product that includes a computer usablemedium is provided. The computer program product includes a computerreadable program for providing a response to a statement of a user,wherein the computer readable program when executed on a computer causesthe computer to: receive user input that comprises at least a portion ofa user statement; select an answerable statement response between ananswerable statement, multiple answerable statements and a request toreceive answerable statement selection information; wherein theselecting is responsive to user input and to structured representationsof answerable statements answerable by an answering entity; send to theuser the answerable statement response; receive an acceptance indicationfrom the user indicative of a user acceptance of an answerablestatement; send to the answering entity information representative ofthe accepted answerable statement; receive from the answering entity theanswering entity response; and send to the user informationrepresentative of the answering entity response.

Variations, modifications, and other implementations of what isdescribed herein will occur to those of ordinary skill in the artwithout departing from the spirit and the scope of the invention asclaimed.

Accordingly, the invention is to be defined not by the precedingillustrative description but instead by the spirit and scope of thefollowing claims.

1. A method for providing a response to a statement of a user, themethod comprising: receiving user input that comprises a portion of auser statement; selecting, before receiving a whole user statement, ananswerable statement response between an answerable statement, multipleanswerable statements and a response to an answerable statement; whereinthe selecting is responsive to user input and to structuredrepresentations of answerable statements answerable by an answeringentity; and sending to the user information representative of responseto the user statement.
 2. The method according to claim 1 comprisingperforming a weighted comparison between basic information unitsextracted from the user input to basic information units associated witheach of the multiple answerable statements.
 3. The method according toclaim 1 comprising selecting between multiple answerable statementsdisplayed to the user in response to audio information provided by theuser.
 4. The method according to claim 1 wherein a knowledge databaseentry comprises an expected user statement field and at least one actionfield; and wherein multiple entries of the knowledge database form adata structure that comprises multiple expected user statements fieldsthat match an expected sequence of user textual inputs.
 5. The methodaccording to claim 1 comprising sending to the user two answerablestatements each answerable statement included in a group of answerablestatements that are associated with each other.
 6. The method accordingto claim 1 comprising updating selection metadata in view of at leastone response of at least one user to at least one answerable statementresponse; wherein the selection metadata affects the selection of theanswerable statement response.
 7. The method according to claim 1comprising applying natural language scripts during the selecting of theanswerable statement.
 8. The method according to claim 1 comprisingselecting a single answerable statement if the single answerablestatement and the user input are characterized by a matching value thatexceeds a first threshold and selecting multiple answerable statementsif each of the multiple answerable statements and the user input arecharacterized by a matching value that exceeds a second threshold but isbelow the first threshold.
 9. The method according to claim 1 comprisingproviding the user an indication relating to unknown words, spellingerrors or at least one difference between user statement and ananswerable statement.
 10. The method according to claim 1 wherein theinformation representative of the response to the user statementresembles the user statement.
 11. A method for interacting with aperson, the method comprising: receiving a user textual input; matchinga structured representation of the user textual input against expecteduser statement fields of knowledge database entries; wherein a knowledgedatabase entry comprises an expected user statement field and at leastone action field; wherein multiple entries of the knowledge databaseform a data structure that comprises multiple expected user statementsfields that match an expected sequence of user textual inputs.
 12. Themethod according to claim 11 wherein at least one action field comprisesa link to another knowledge database entry that comprises anotherexpected user statement field and at least one other action field. 13.The method according to claim 11 comprising graphically displaying linksbetween multiple linked knowledge database entries that form the datastructure.
 14. The method according to claim 11 wherein an action fieldcomprises a flow control commands selected from a group consisting of:an if command, an else command, a call command, a goto command, an inputcommand.
 15. The method according to claim 11 comprising detecting aneed to request an intervention of a third party to respond to userinput.
 16. The method according to claim 11 comprising allowing a userto review previous user inputs and previous responses to choose to altera previous selection or input of the user and to get an updatedresponse.
 17. The method according to claim 11 wherein the expectedstatement field of a single knowledge database entry comprises at leastone concise way of expressing an idea in natural language.
 18. Themethod according to claim 11 comprising providing the user an indicationrelating to unknown words, spelling errors or at least one differencebetween user statement and an answerable statement.
 19. A computerprogram product comprising a computer usable medium including a computerreadable program for providing a response to a statement of a user,wherein the computer readable program when executed on a computer causesthe computer to: receive user input that comprises a portion of a userstatement; select, before receiving a whole user statement, ananswerable statement response between an answerable statement, multipleanswerable statements and a response to an answerable statement; whereinthe selection is responsive to user input and to structuredrepresentations of answerable statements answerable by an answeringentity; and send to the user information representative of response tothe user statement.
 20. The computer program product according to claim19 wherein the information representative of the response to the userstatement resembles the user statement.
 21. A computer program productcomprising a computer usable medium including a computer readableprogram for providing a response to a statement of a user, wherein thecomputer readable program when executed on a computer causes thecomputer to: receive a user textual input; match a structuredrepresentation of the user textual input against expected user statementfields of knowledge database entries; wherein a knowledge database entrycomprises an expected user statement field and at least one actionfield; wherein multiple entries of the knowledge database form a datastructure that comprises multiple expected user statements fields thatmatch an expected sequence of user textual inputs.
 22. The computerprogram product according to claim 21 wherein at least one action fieldcomprises a link to another knowledge database entry that comprisesanother expected user statement field and at least one other actionfield.
 23. The computer program product according to claim 21 whereinthe computer readable program when executed on a computer causes thecomputer to: graphically display links between multiple linked knowledgedatabase entries that form the data structure.
 24. The computer programproduct according to claim 21 wherein an action field comprises a flowcontrol commands selected from a group consisting of: an if command, anelse command, a call command, a goto command, an input command.
 25. Thecomputer program product according to claim 21 wherein the computerreadable program when executed on a computer causes the computer to:allow a user to review previous user inputs and previous responses tochoose to alter a previous selection or input of the user and to get anupdated response.